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7. Spatial Distribution Measurement of High Energy Particle using Time-Of-Flight Neutral Particle Energy Analyzer in Large Helical Device

Author

G1/G2 Group, Ozaki, T., Goncharov, P., Murakami, S., Sudo, S., Shoji, M., Emoto, M., Funaba, H., Goto, M., Ida, K., Idei, H., Ikeda, K., Kanko, O., Kawahata, K., Kobuchi, T., Kubo, S., Kumazawa, R., Morita, S., Motojima, O., Muto, S., Mutoh, T., Nagayama, Y., Nakamura, Y., Nakanishi, H., Narihara, K., Noda, N., Ohdachi, S., Ohyabu, N., Oka, Y., Osakabe, M., Peterson, B., Saito, K., Sakakibara, S., Sasao, M., Sato, K., Seki, T., Shimozuma, T., Takeiri, Y., Tanaka, K., Torii, H., Tsumori, K., Watanabe, T., Watari, T., Zanza, V., Bracco, G., Sibio, A., Tilia, B., Stott, Peter E., editor, Wootton, Alan, editor, Gorini, Giuseppe, editor, Sindoni, Elio, editor, and Batani, Dimitri, editor

Published
2002
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9. Particle control in long-pulse discharge using divertor pumping in LHD

Author

Motojima, G, primary, Masuzaki, S, additional, Morisaki, T, additional, Watanabe, K Y, additional, Kobayashi, M, additional, Ida, K, additional, Sakamoto, R, additional, Yoshinuma, M, additional, Seki, R, additional, Nuga, H, additional, Tsujimura, T, additional, Suzuki, C, additional, Emoto, M, additional, Tsuchibushi, Y, additional, Murase, T, additional, and Takeiri, Y, additional

Published
2022
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13. Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device

Author

Sanders, Mike, Ida, Katsumi, Yoshinuma, M., Suzuki, C., Yoshimura, Y., Seki, Ryosuke, Emoto, M., Yoshida, M., Kobayashi, T., Sanders, Mike, Ida, Katsumi, Yoshinuma, M., Suzuki, C., Yoshimura, Y., Seki, Ryosuke, Emoto, M., Yoshida, M., and Kobayashi, T.

Abstract

The analysis method of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profiles in the Large Helical Device has been improved. This was done by using the Variational Moments Equilibrium Code to calculate an equilibrium database for various pressure profiles and current profiles. This method looks for the radial profile of the rotational transform in the equilibrium database that gives the best fit to the polarization angle profiles measured with the MSE diagnostic. This analysis improves the measurements of rotational transform, especially near the magnetic axis, where the sensitivity of the polarization angle measurements becomes low and the uncertainty due to error in the estimation of the Pfirsch–Schlüter current becomes large. The radial profiles of the rotational transform and current profiles for Electron Cyclotron Current Drive and Neutral Beam Current Drive are obtained in the new analysis method with a sufficiently high accuracy to discuss the discrepancy of the current density profiles between the measurements and the calculations.

Published
2021

14. Overview of transport and MHD stability study: focusing on the impact of magnetic field topology in the Large Helical Device

Author

Ida, K., Nagaoka, K., Inagaki, S., Kasahara, H., EVANS5, Todd, Yoshinuma, M., Kamiya, K., Ohdachi, S., Osakabe, M., Kobayashi, M., Sudo, S., Itoh, K., Akiyama, T., Emoto, M., DINKLAGE, Andreas, Du, X., Fujii, K., Goto, M., GOTO, Takuya, HASUO, Masahiro, Hidalgo, C., Ichiguchi, K., Ishizawa, A., JAKUBOWSKI, Marcin, KAWAMURA, Gakushi, Kato, D., Morita, S., Mukai, Kiyofumi, Murakami, I., Murakami, S., Narushima, Y., Nunami, M., OHNO, Noriyasu, Pablant, N., Sakakibara, S., Seki, T., Shimozuma, T., SHOJI, M., Tanaka, K., Tokuzawa, T., Todo, Y., Wang, H., Collaborators, Ida, K., Nagaoka, K., Inagaki, S., Kasahara, H., EVANS5, Todd, Yoshinuma, M., Kamiya, K., Ohdachi, S., Osakabe, M., Kobayashi, M., Sudo, S., Itoh, K., Akiyama, T., Emoto, M., DINKLAGE, Andreas, Du, X., Fujii, K., Goto, M., GOTO, Takuya, HASUO, Masahiro, Hidalgo, C., Ichiguchi, K., Ishizawa, A., JAKUBOWSKI, Marcin, KAWAMURA, Gakushi, Kato, D., Morita, S., Mukai, Kiyofumi, Murakami, I., Murakami, S., Narushima, Y., Nunami, M., OHNO, Noriyasu, Pablant, N., Sakakibara, S., Seki, T., Shimozuma, T., SHOJI, M., Tanaka, K., Tokuzawa, T., Todo, Y., Wang, H., and Collaborators

Abstract

The progress in the understanding of the physics and the concurrent parameter extension in the large helical device since the last IAEA-FEC, in 2012 (Kaneko O et al 2013 Nucl. Fusion 53 095024), is reviewed. Plasma with high ion and electron temperatures (Ti(0) ~ Te(0) ~ 6 keV) with simultaneous ion and electron internal transport barriers is obtained by controlling recycling and heating deposition. A sign flip of the nondiffusive term of impurity/momentum transport (residual stress and convection flow) is observed, which is associated with the formation of a transport barrier. The impact of the topology of three-dimensional magnetic fields (stochastic magnetic fields and magnetic islands) on heat momentum, particle/impurity transport and magnetohydrodynamic stability is also discussed. In the steady state operation, a 48 min discharge with a line-averaged electron density of 1 × 1019 m−3 and with high electron and ion temperatures (Ti(0) ~ Te(0) ~ 2 keV), resulting in 3.36 GJ of input energy, is achieved., source:K. Ida et al 2015 Nucl. Fusion 55 104018, source:https://doi.org/10.1088/0029-5515/55/10/104018, identifier:0000-0002-0585-4561

Published
2021

16. Control, data acquisition, data analysis and remote participation in LHD

Author

Nagayama, Y., Emoto, M., Nakanishi, H., Sudo, S., Imazu, S., Inagaki, S., Iwata, C., Kojima, M., Nonomura, M., Ohsuna, M., Tsuda, K., Yoshida, M., Chikaraishi, H., Funaba, H., Horiuchi, R., Ishiguro, S., Ito, Y., Kubo, S., Mase, A., Mito, T., Miyazawa, J., Mutoh, T., Nakamura, Y., Saito, K., Sakamoto, R., Seki, T., Shoji, M., Takami, S., Watanabe, T., Yamamoto, T., Komori, A., and Motojima, O.

Published
2008
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17. Vascular endothelial growth factor-D is an independent prognostic factor in epithelial ovarian carcinoma

Author

Yokoyama, Y, Charnock-Jones, DS, Licence, D, Yanaihara, A, Hastings, JM, Holland, CM, Emoto, M, Umemoto, M, Sakamoto, T, Sato, S, Mizunuma, H, and Smith, SK

Subjects
Adult, Ovarian Neoplasms, Vascular Endothelial Growth Factor C, Vascular Endothelial Growth Factor D, Endothelial Growth Factors, Middle Aged, Prognosis, Vascular Endothelial Growth Factor Receptor-3, Adenocarcinoma, Mucinous, Cystadenocarcinoma, Serous, Immunoenzyme Techniques, Lymphatic Metastasis, Biomarkers, Tumor, Humans, Female, Neoplasms, Glandular and Epithelial, Peritoneal Neoplasms, Adenocarcinoma, Clear Cell, Aged, Retrospective Studies
Abstract

We assessed the presence of vascular endothelial growth factor (VEGF)-C, VEGF-D and their receptor VEGFR-3 by immunohistochemistry in 59 epithelial ovarian carcinomas, 11 borderline tumours and 20 benign cystadenomas. VEGF-C and VEGF-D were generally expressed in tumour cells and also in endothelia adjacent to tumour nests which showed a strong staining for them. VEGFR-3 was expressed in lymphatic and vascular endothelial cells adjacent to tumour nests. Immunoreactivity was significantly more frequent as lesions progressed from a benign tumour to advanced carcinoma. A strong correlation was found between VEGF-C and VEGF-D detected in carcinoma and VEGFR-3 detected in neighbouring endothelial cells. Increased expression of VEGF-C, VEGF-D and VEGFR-3 was significantly associated with lymph node metastasis and peritoneal metastasis outside the pelvis. There was a significant correlation between the high levels of VEGF-C and VEGF-D proteins, and poor survival. The presence of VEGF-D was an independent prognostic indicator by multivariate analysis. We conclude that VEGF-C, VEGF-D and VEGFR-3 play an important role in lymphatic spread and intraperitoneal tumour development in ovarian carcinoma. Since VEGF-D was found to be an independent predictor of poor outcome, its measurement, together with other prognostic markers may improve prospective identification of patients with a poor prognosis.

Published
2020
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23. Construction of a first-generation physical map of the rice genome

Author

Ashikawa, I., primary, Umehara, Y., additional, Tanoue, H., additional, Wang, Z., additional, Saji, S., additional, Shimokawa, T., additional, Yoshino, K., additional, Wu, J., additional, Antonio, B., additional, Koike, K., additional, Van Houten, W., additional, Idonuma, A., additional, Emoto, M., additional, Kurata, N., additional, and Sasaki, T., additional

Published
2008
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25. Computer simulation for stability analysis using a one-dimensional model

Author

Emoto, M. and Ymaguchi, S.

Subjects
Computer simulation, Stability -- Analysis, Superconductivity -- Analysis, Superconductors -- Evaluation, Business, Electronics, Electronics and electrical industries
Abstract

The magnetic field profile effect of the recovery current and the initial temperature profiles of the minimum propagation current are presented. The profiles were derived using a computer simulation program of normal-state propagation that was constructed using a one-dimensional model. The results of the simulation were verified using the data obtained from short-sample tests conducted on the helical coil conductor for the Large Helical Device at the National Institute for Fusion Science.

Published
1999

26. Local island divertor experiments on LHD

Author

Morisaki, T., Masuzaki, S., Komori, A., Ohyabu, N., Kobayashi, M., Feng, Y., Sardei, F., Narihara, K., Tanaka, K., Ida, K., Peterson, B.J., Yoshinuma, M., Ashikawa, N., Emoto, M., Funaba, H., Goto, M., Ikeda, K., Inagaki, S., Kaneko, O., Kawahata, K., Kubo, S., Miyazawa, J., Morita, S., Nagaoka, K., Nagayama, Y., Nakanishi, H., Ohkubo, K., Oka, Y., Osakabe, M., Shimozuma, T., Shoji, M., Takeiri, Y., Sakakibara, S., Sakamoto, R., Sato, K., Toi, K., Tsumori, K., Watababe, K.Y., Yamada, H., Yamada, I., Yoshimura, Y., and Motojima, O.

Published
2005
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32. The isotope effect on impurities and bulk ion particle transport in the Large Helical Device

Author

Ida, Katsumi, Sakamoto, R., Yoshinuma, Mikirou, Yamazaki, K., Kobayashi, Tatsuya, Fujiwara, Y., Suzuki, C., Fuji, K., Chen, J., Masuzaki, S., Emoto, M., Mackenbach, Ralf, Ida, Katsumi, Sakamoto, R., Yoshinuma, Mikirou, Yamazaki, K., Kobayashi, Tatsuya, Fujiwara, Y., Suzuki, C., Fuji, K., Chen, J., Masuzaki, S., Emoto, M., and Mackenbach, Ralf

Abstract

The isotope effect on impurities and bulk ion particle transport is investigated by using the deuterium, hydrogen, and isotope mixture plasma in the Large Helical Device (LHD). A clear isotope effect is observed in the impurity transport but not the bulk ion transport. The isotope effects on impurity transport and ion heat transport are observed as a primary and a secondary effect, respectively, in the plasma with an internal transport barrier (ITB). In the LHD, an ion ITB is always transient because the impurity hole triggered by the increase of ion temperature gradient causes the enhancement of ion heat transport and gradually terminates the ion ITB. The formation of an impurity hole becomes slower in the deuterium (D) plasma than the hydrogen (H) plasma. This primary isotope effect on impurity transport contributes the longer sustainment of the ion ITB state because the low ion thermal diffusivity can be sustained as long as the normalized carbon impurity gradient R/L n,c, where L c =-(∇n c/n c) -1 is above the critical value (∼-5). Therefore, the longer sustainment of the ITB state in the deuterium plasma is considered to be a secondary isotope effect due to the mitigation of the impurity hole. The radial profile of H and D ion density is measured using bulk charge exchange spectroscopy inside the isotope mixture plasma. The decay time of H ion density after the H-pellet injection and the decay time of D ion density after D-pellet injection are almost identical, which demonstrates that there is no significant isotope effect on ion particle transport.

Published
2019

39. W-band millimeter-wave back-scattering system for high wavenumber turbulence measurements in LHD.

Author

Tokuzawa, T., Tanaka, K., Tsujimura, T., Kubo, S., Emoto, M., Inagaki, S., Ida, K., Yoshinuma, M., Watanabe, K. Y., Tsuchiya, H., Ejiri, A., Saito, T., and Yamamoto, K.

Subjects
HETERODYNE detection, TURBULENCE, ANTENNAS (Electronics), MEASUREMENT
Abstract

A 90 GHz W-band millimeter-wave back-scattering system is designed and installed for measuring electron scale turbulence (k⊥ρs ∼ 40). A metal lens relay antenna is used for in-vessel beam focusing, and a beam diameter of less than 40 mm is achieved in the plasma core region. This antenna can be steered at an angle of 159° ± 6°, which almost covers the plasma radius. The estimated size of the scattering volume is ∼105 mm at the edge and 135 mm at the core, respectively. A 60 m corrugated waveguide is used to achieve a low transmission loss of ∼8 dB. A heterodyne detection system for millimeter-wave circuits with probing power modulation can distinguish the scattered signal from background noise. [ABSTRACT FROM AUTHOR]

Published
2021
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47. Observation of the bulk ion density peaking in a discharge with an impurity hole in the LHD

Author

Perek, A., Ida, K., Yoshinuma, M., Goto, M., Nakamura, Y., Emoto, M., Jaspers, R., Perek, A., Ida, K., Yoshinuma, M., Goto, M., Nakamura, Y., Emoto, M., and Jaspers, R.

Abstract

Radial profiles of bulk ion and impurity ions density are simultaneously measured and quantified using charge exchange spectroscopy and peaking parameter, Cv. The peaking parameter is positive for inward and negative for outward convection in a plasma with an impurity hole in the Large Helical Device. Following the formation of an impurity hole associated with the transition from L-mode to ion ITB plasma, the bulk ion becomes peaked by the inward convection (Cv>0), while impurities (helium and carbon) become hollow due to the outward convection (Cv<0). In contrast to the ion ITB plasma, in the L-mode plasma the impurity profiles are peaked (Cv>0), where the bulk ion density profile remains flat (Cv∼0). Understanding of the impurity behavior in the ion ITB plasma could lead to a self cleaning plasma reactor concept, with an efficient impurity exhaust.

Published
2017

48. Efficacy of galantamine treatment in very early stage of APPswe/PS1dE9 mice

Author

Saito, T., primary, Hisahara, S., additional, Kawamata, J., additional, Matsumura, A., additional, Iwahara, N., additional, Yokokawa, K., additional, Fujikura, M., additional, Manabe, T., additional, Suzuki, H., additional, Matsushita, T., additional, Suzuki, S., additional, Emoto, M., additional, and Shimohama, S., additional

Published
2017
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49. Extension of the operational regime of the LHD towards a deuterium experiment

Author

Takeiri, Y., primary, Morisaki, T., additional, Osakabe, M., additional, Yokoyama, M., additional, Sakakibara, S., additional, Takahashi, H., additional, Nakamura, Y., additional, Oishi, T., additional, Motojima, G., additional, Murakami, S., additional, Ito, K., additional, Ejiri, A., additional, Imagawa, S., additional, Inagaki, S., additional, Isobe, M., additional, Kubo, S., additional, Masamune, S., additional, Mito, T., additional, Murakami, I., additional, Nagaoka, K., additional, Nagasaki, K., additional, Nishimura, K., additional, Sakamoto, M., additional, Sakamoto, R., additional, Shimozuma, T., additional, Shinohara, K., additional, Sugama, H., additional, Watanabe, K.Y., additional, Ahn, J.W., additional, Akata, N., additional, Akiyama, T., additional, Ashikawa, N., additional, Baldzuhn, J., additional, Bando, T., additional, Bernard, E., additional, Castejón, F., additional, Chikaraishi, H., additional, Emoto, M., additional, Evans, T., additional, Ezumi, N., additional, Fujii, K., additional, Funaba, H., additional, Goto, M., additional, Goto, T., additional, Gradic, D., additional, Gunsu, Y., additional, Hamaguchi, S., additional, Hasegawa, H., additional, Hayashi, Y., additional, Hidalgo, C., additional, Higashiguchi, T., additional, Hirooka, Y., additional, Hishinuma, Y., additional, Horiuchi, R., additional, Ichiguchi, K., additional, Ida, K., additional, Ido, T., additional, Igami, H., additional, Ikeda, K., additional, Ishiguro, S., additional, Ishizaki, R., additional, Ishizawa, A., additional, Ito, A., additional, Ito, Y., additional, Iwamoto, A., additional, Kamio, S., additional, Kamiya, K., additional, Kaneko, O., additional, Kanno, R., additional, Kasahara, H., additional, Kato, D., additional, Kato, T., additional, Kawahata, K., additional, Kawamura, G., additional, Kisaki, M., additional, Kitajima, S., additional, Ko, W.H., additional, Kobayashi, M., additional, Kobayashi, S., additional, Kobayashi, T., additional, Koga, K., additional, Kohyama, A., additional, Kumazawa, R., additional, Lee, J.H., additional, López-Bruna, D., additional, Makino, R., additional, Masuzaki, S., additional, Matsumoto, Y., additional, Matsuura, H., additional, Mitarai, O., additional, Miura, H., additional, Miyazawa, J., additional, Mizuguchi, N., additional, Moon, C., additional, Morita, S., additional, Moritaka, T., additional, Mukai, K., additional, Muroga, T., additional, Muto, S., additional, Mutoh, T., additional, Nagasaka, T., additional, Nagayama, Y., additional, Nakajima, N., additional, Nakanishi, H., additional, Nakano, H., additional, Nakata, M., additional, Narushima, Y., additional, Nishijima, D., additional, Nishimura, A., additional, Nishimura, S., additional, Nishitani, T., additional, Nishiura, M., additional, Nobuta, Y., additional, Noto, H., additional, Nunami, M., additional, Obana, T., additional, Ogawa, K., additional, Ohdachi, S., additional, Ohno, M., additional, Ohno, N., additional, Ohtani, H., additional, Okamoto, M., additional, Oya, Y., additional, Ozaki, T., additional, Peterson, B.J., additional, Preynas, M., additional, Sagara, S., additional, Saito, K., additional, Sakaue, H., additional, Sanpei, A., additional, Satake, S., additional, Sato, M., additional, Saze, T., additional, Schmitz, O., additional, Seki, R., additional, Seki, T., additional, Sharov, I., additional, Shimizu, A., additional, Shiratani, M., additional, Shoji, M., additional, Skinner, C., additional, Soga, R., additional, Stange, T., additional, Suzuki, C., additional, Suzuki, Y., additional, Takada, S., additional, Takahata, K., additional, Takayama, A., additional, Takayama, S., additional, Takemura, Y., additional, Takeuchi, Y., additional, Tamura, H., additional, Tamura, N., additional, Tanaka, H., additional, Tanaka, K., additional, Tanaka, M., additional, Tanaka, T., additional, Tanaka, Y., additional, Toda, S., additional, Todo, Y., additional, Toi, K., additional, Toida, M., additional, Tokitani, M., additional, Tokuzawa, T., additional, Tsuchiya, H., additional, Tsujimura, T., additional, Tsumori, K., additional, Usami, S., additional, Velasco, J.L., additional, Wang, H., additional, Watanabe, T.-H., additional, Watanabe, T., additional, Yagi, J., additional, Yajima, M., additional, Yamada, H., additional, Yamada, I., additional, Yamagishi, O., additional, Yamaguchi, N., additional, Yamamoto, Y., additional, Yanagi, N., additional, Yasuhara, R., additional, Yatsuka, E., additional, Yoshida, N., additional, Yoshinuma, M., additional, Yoshimura, S., additional, and Yoshimura, Y., additional

Published
2017
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